What is the truck apron in a roundabout?

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When a long truck turns in a roundabout, its rear wheels don’t follow the same path as the front wheels because of the vehicle’s long wheelbase. The truck apron is the paved area on the inside edge of the roundabout that those rear wheels can ride on during the turn. This extra space lets the back end swing around safely without scraping the curb or leaving the roundabout’s inner lane, which helps large vehicles maneuver tighter turns. It’s not a driving lane for everyday traffic, nor is it decorative or part of the outer edge of the roundabout.